Three Sisters Loop Backpacking Guide

View of South Sister from Husband Lake - Wowzers


Three Sisters Loop Backpacking Guide

If you’re the type of backpacker that’s into big views, lush forests, stunning peaks, and craggy volcanic landscapes (and who’s not!), then you’ll absolutely love the Three Sisters Loop. Here’s a quick guide on how to make the most of your trip. 

The Three Sisters Loop is an iconic 3-6 day backpacking trip set in the Cascade Range among some of Oregon’s prettiest peaks. This 50-mile loop circles the North, Middle, and South Sister volcanoes, providing a fantastic array of diverse terrain. Take this amazing journey and wander through rugged volcanic landscapes complete with expansive pumice fields, pristine melt lakes, quiet old-growth forests, newly recovering burn areas, peaceful wildflower meadows, and glossy obsidian streams. This is truly a trip that cannot be missed!


  • Sweeping Volcano Views

  • Diverse Landscapes

  • Gorgeous Lakes & Streams

  • Wildflowers & Forests

  • Well Maintained Trails

  • Fascinating Rock Formations

  • An Array of Excellent Side Trips


  • Crowds

  • Limited Camping Areas

  • Limited Campfire Areas

  • Seasonal Bugs, Snow, and Heat

Dave in Front of South Sister

Best Time to Travel

Late July to October is usually a great time to travel to this area. August and September are particularly good months for this route because of their reliable weather and snow-free trails, but that’s also when the weekend crowds will be the largest. Plan your trip to avoid the crowds if possible.

Early season snow pack can be a limiting factor in this area and late seasons storms can cover trails with snow as well. So make sure to check weather forecasts and snow conditions before heading out on an early or late season trek.


The length of the inner loop is 46.3 miles, but when you factor a short hike in from a trailhead, your total distance will be around 50 miles. Lava Camp Trailhead (3 miles off the loop), Devils Lake Trailhead (1.5 miles), and Green Lakes Trailhead (2 miles) are common starting points for this trip.

Pacific Crest Trail with North & Middle Sister


This trip is a good fit for intermediate to experienced backpackers. The trails along this route are well maintained and well marked. Trails are also graded with switchbacks to avoid steep ups and downs as much as possible. 

Packing light will definitely help improve your experience while you’re covering miles on this trek. Check out my HD Tutorial Videos and Gear Guide for some great tips on how to comfortably reduce your pack weight.


Nature isn’t flat and volcanoes are rugged, so you should still expect some decent climbs along this trek. Most of the climbs are only between 500 and 700 feet and they’re generally not too steep either, but there are a few bigger climbs as well.  Your total elevation gain along this loop will be between 6,000 and 10,000 feet, depending on the side trips you choose to take.

Middle and North Sister from above Camp Lake


Permits are required for this loop, but you can fill one out at the trailhead when you arrive - except for the Obsidian Trailhead.

The Obsidian trailhead is a limited entry area, which means you’ll need to get a permit if you plan on parking or camping in that part of the loop (you can pass through on the trail without a permit though). This should not be considered a limiting factor if you can’t get a permit for the time you plan to visit. Just use one of the other trailheads and plan to camp outside of the Obsidian limited entry area. There are tons of beautiful places to camp outside the Obsidian limited entry area. 


Leave No Trace backpacking is extremely important in this area because it is so popular. Know the rules and follow them to limit your impact.

Camping is limited to established campsites at North and South Matthieu Lakes, Green Lakes, and Moraine Lake. Only camp in designated areas.

No fires are allowed at many of the lakes in this area. This includes Camp, Chambers, Green, Moraine, Sisters Mirror, Eileen, Husband, Golden and others. 

There is currently no camping allowed in the recovering Pole Creek Burn Area, which spans about six miles along the east side of this loop. You can walk through the area, the water sources are still flowing, and the trail is well marked. You just can’t hike off trail or camp there. 

As mentioned in the permits section, a permit is required to park or camp at the Obsidian Limited Entry Area.

There are no specific regulations about bear canisters in this area, but you should still plan to properly store your food. Never feed any wild animals.

South Sister View from Green Lake

Maps & Guides

Side Trips

There are a number of fantastic side trip options along this loop that are highly recommended if you have the time. Among the most popular and beautiful are the trips to Camp Lake, the South Sister Summit, Sisters Mirror Lake, Husband Lake, Eileen Lake, and North Matthieu Lake. These side trips will not disappoint.  

Forrest View - Three Sisters Wilderness 


Water is not scarce along this trek, but it’s not quite as plentiful as in many other Northwest backpacking locations. Plan your route accordingly and check on water conditions before your trip. Bring along a lightweight water filter – see my favorite here – and carry enough water to get you from one sure source to the next.

Food Storage

There are bears in the Three Sisters Wilderness, but seeing them is quite rare. It’s far more likely that chipmunks and mice will get into your food if you leave it unprotected. Bear canisters shouldn’t be considered necessary, but you should still protect your food from all wild animals.

Broken Top view from the Pole Creek Burn Area


The most common trailheads to start this loop hike are listed below. All of them are fantastic places to start this hike. You can’t really go wrong.

Additional Resources

Three Sisters Wilderness – Outdoor Project. Get pumped up with some beautiful photography and great information about the Three Sisters Wilderness from the Outdoor Project. 

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South Sister from Camp Lake